<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
     body{
         font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif
     }
     /* 最小的字体-->不要小于12px
        font-size:字体大小
        字体样式
        font-style:normal|italic 
        字体的权重
        font-weight:bold|bolder|lighter
        100-900    */
     p{
         font-size: 14px;
         font-style:initial;
         font-weight: lighter;
     }
    </style>
</head>
<body>
    <div class="p">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Commodi ducimus culpa, nam vitae suscipit magni modi quisquam explicabo illum ea repellat, cum aliquam blanditiis unde fugiat laudantium! Reiciendis, voluptatum quos.</p>
    <i>hello world</i>
</div>
</body>
</html>